PDF malware analysis — malicious · 8b84536dc09ac96c

MALICIOUS

PDF

54.0 KB Created: 2020-08-12 01:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b71cdfe3fb1e5622914c63a6d224f586 SHA-1: 7beaee7a13b2b6ea54e8d07f567922dc20f0cfda SHA-256: 8b84536dc09ac96c40e60c67f4b46ef9a1279dd0b43ac833ee8f7af93ea8efb1

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords to potentially deceive users into downloading malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous malicious links is sufficient evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/pify?keyword=simple+algorithm+examples+pdf
- http://files.kathygaulke.com/uploads/1/3/0/8/130874122/33698.pdf
- http://files.cprsd2.com/uploads/1/3/1/6/131607131/6576711.pdf
- http://files.abovethecloudsretreats.com/uploads/1/3/1/4/131438128/3729752.pdf
- https://cdn.shopify.com/s/files/1/0435/8212/8291/files/95495691200.pdf
- https://cdn.shopify.com/s/files/1/0431/3192/8740/files/ominous_octet_defronzo.pdf
- https://cdn.shopify.com/s/files/1/0427/6623/7852/files/bisagolafu.pdf
- https://cdn.shopify.com/s/files/1/0437/7378/8321/files/biochemistry_book_by_u_satyanarayana.pdf
- https://cdn.shopify.com/s/files/1/0435/3438/5303/files/87962743461.pdf
- https://cdn.shopify.com/s/files/1/0432/6454/0840/files/22563374844.pdf
- https://cdn.shopify.com/s/files/1/0428/4933/7500/files/rixedepefosoraxumojode.pdf
- https://cdn.shopify.com/s/files/1/0430/8900/2653/files/raronalaxunejapaj.pdf
- https://cdn.shopify.com/s/files/1/0427/6033/9623/files/jexakeratosuj.pdf
- https://cdn.shopify.com/s/files/1/0434/3637/6231/files/70520558223.pdf
- https://cdn.shopify.com/s/files/1/0429/0061/9423/files/mosaicos_6th_edition_download.pdf
- https://cdn.shopify.com/s/files/1/0435/4025/0775/files/70570616894.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
- https://cdn.shopify.com/s/files/1/0433/9741/5077/files/77648323809.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00009349.bin` `cc62c6c9a102515b433faacff1dbcc8b0af54f0758dcd9eebcd87ec157cb5f35`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9349	5624 bytes
`font_01_sfnt_off0000a641.bin` `bb105e95219a14e1a178f057baa2b7a72f96a49d7b61c6210d2c35cc9466dab1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA641	10704 bytes

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